older snippets

Author: delabassee

Diff for: java21/HelloWorld.snippet

@@ -0,0 +1,3 @@
+var name = "Duke";
+System.out.println("👋 Hello, " + name);
+

Diff for: java21/Record_1.snippet

@@ -0,0 +1,3 @@
+record Player(String last, String first, int level) {}
+var jane = new Player("Doe", "Jane", 42);
+System.out.println(jane);

Diff for: java21/Record_2.snippet

@@ -0,0 +1,11 @@
+record Population(int population) {}
+record City(String name, Population population) {
+    // static methods are allowed in records
+    public static City of(String name, int p) {
+        var population = new Population(p);
+        return new City(name, population);
+    }
+}
+
+var paris = City.of("Paris", 2_161);
+System.out.println(paris);

Diff for: java21/Record_3.snippet

@@ -0,0 +1,18 @@
+record City(String name) {
+
+    public boolean equals(Object other) {
+        return other instanceof City(String name) &&
+                this.name.equalsIgnoreCase(name);
+    }
+
+    public int hashCode() {
+        return name != null ? name.toUpperCase().hashCode() : 0;
+    }
+}
+
+var paris1 = new City("Paris");
+var paris2 = new City("paris");
+var paris3 = new City("PARIS");
+System.out.println("1 == 2 ? " + paris1.equals(paris2));
+System.out.println("2 == 3 ? " + paris2.equals(paris3));
+System.out.println("1 == 3 ? " + paris1.equals(paris3));

Diff for: java21/Stream_1.snippet

@@ -0,0 +1,8 @@
+List<String> cities =
+            Arrays.asList("Shenzhen", "Brussels", "Taipei", "Buenos Aires", "Sydney", "Bristol");
+
+cities.stream()
+      .filter(s -> s.startsWith("B"))
+      .map(String::toUpperCase)
+      .sorted()
+      .forEach(System.out::println);

Diff for: java21/Stream_2.snippet

@@ -0,0 +1,5 @@
+Stream<String> stream = Stream.of("Shenzhen", "Brussels", "Taipei", "Buenos Aires", "Sydney", "Bristol");
+
+List<String> cities = stream.sorted().collect(Collectors.toList());
+
+System.out.println(cities);

Diff for: java21/Stream_3.snippet

@@ -0,0 +1,11 @@
+var cities = """
+      San Francisco
+      Casablanca
+      Antwerp
+      New Delhi
+      Osaka
+""";
+
+Stream<String> lines = cities.lines();
+
+System.out.println(lines.toList());